Point to point T1 question

[AnneArkee]

I currently have a point to point, non frame relay,T1 set up.

LAN -> 2600 -> T1 <- 2600 <- LAN

I am using default HDLC. The connection has been up and running for over a month now with no problems. I have been told that I need to add clock rate to the serial interface. My question is if this is actually required? If so, how come I have not had any problems? And what rate should be used?

router 1

interface Serial0/0
ip address 10.10.10.2 255.255.255.252
ipx network 123
ipx type-20-propagation
service-module t1 remote-alarm-enable

router 2

interface Serial0/0
ip address 10.10.10.1 255.255.255.252
ipx network 123
ipx type-20-propagation
service-module t1 remote-alarm-enable

Thanks in advance for your response.

 

[CCIEWANNABE]

The circuit provider must provide clocking, data framing, and line encoding information to configure DSU/CSU successfully. Route once; switch many

 

[stoney66]

So the answer is... NO you dont need to do anything.

stoney.

 

[BuckWeet]

Verify if your provider is providing clocking. usually they do, but another thing if you have multiple T1's going into a headend router, you usually need to do the clocking to keep everything in synch. all the remote sites would then feed clock off of the headend.

But yes, by default they get clocking off of the network..

to see if you're having problems you can do a &quot;show interface s0/0&quot; or whatever your serial port is, see if you have input errors, or CRC errors. As that usually defines clocking issues. Depending on the card, if its a WIC-1DSU-T1 card you could do this command as well &quot;sh service-module ser s0/0&quot; or if its a module that uses the t1 controller you can do the &quot;show controller t1 0/0&quot; command.. Both of those commands will point out line slips, loss of frames, line code violations. etc....


hope this helps


BuckWeet

 

[jeter]

That is not correct!!!! You need to have one router internal and the other router external clocking on a point to point. “Reserve your right to think, for even to think wrongly is better than not to think at all”

Fisher CCNA

 

[techkiwi]

This is getting complex, isn't it?!

On a point to point circuit, you have ONE clock source only. Now normally this will be from your Telco or your circuit provider. I'm in New Zealand so not familiar with exact details in US, but it will be pretty much identical to here.

In NZ the term &quot;point to point&quot; circuit can be used to refer to a standard E1 circuit (our equivalent to your T1). In which case it goes through a clocked network, so the circuit provider is providing clocking.

Or a &quot;point to point&quot; network may also be used to refer to a circuit that is literally a pair of wires with a DSU on either end - meaning that it is not going through a clocked network, so at first glance you could say the circuit provider is not providing clocking. BUT even in this case normally the DSU's will be configured in a master/slave configuration IE one of the DSU's provides clocking.

In either case, to you as the end user it will seem the same - your circuit provider is providing clocking.

Now in your case you say that the circuit is up and running. Okay, you are getting clocking from somewhere. If you had no clocking, your circuit wouldn't be working. Simple as that.

Who has told you that need to provide clocking, and why? This might help us understand things better.

Graham.

 

[AnneArkee]

I set the routers up and then the customer had their Pix guy look over my configs. Of course, since he hadn't set it up, there were &quot;obvious&quot; &quot;configuration errors&quot; on my part. I knew I didn't need the clocking but was not sure how to prove it to the customer. Thanks for everyone's repsonses. Very helpful.